added link state api

webshell/public/nsILinkHandler.h

@@ -29,6 +29,14 @@ struct nsGUIEvent;
 { 0x52bd1e30, 0xce3f, 0x11d1, \
   {0x93, 0x28, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }
 
+enum nsLinkState {
+  eLinkState_Unvisited  = 0,
+  eLinkState_Visited    = 1, 
+  eLinkState_OutOfDate  = 2,  // visited, but the cache is stale
+  eLinkState_Active     = 3,  // mouse is down on link
+  eLinkState_Hover      = 4   // mouse is hovering over link
+};
+
 /**
  * Interface used for handling clicks on links
  */
@@ -46,6 +54,11 @@ public:
    */
   NS_IMETHOD OnLinkClick(nsIFrame* aFrame, const nsString& aURLSpec,
                          const nsString& aTargetSpec) = 0;
+
+  /**
+   * Get the state of a link to a given absolute URL
+   */
+  NS_IMETHOD GetLinkState(const nsString& aURLSpec, nsLinkState& aState) = 0;
 };
 
 // Standard link handler that does what you would expect (XXX doc...)

webshell/src/nsLinkHandler.cpp

@@ -42,6 +42,7 @@ public:
   NS_IMETHOD GetWebWidget(nsIWebWidget** aResult);
   NS_IMETHOD OnLinkClick(nsIFrame* aFrame, const nsString& aURLSpec,
 			 const nsString& aTargetSpec);
+  NS_IMETHOD GetLinkState(const nsString& aURLSpec, nsLinkState& aState);
 
   void HandleLinkClickEvent(const nsString& aURLSpec,
 			    const nsString& aTargetSpec);
@@ -153,6 +154,28 @@ NS_IMETHODIMP LinkHandlerImpl::OnLinkClick(nsIFrame* aFrame,
   return NS_OK;
 }
 
+NS_IMETHODIMP LinkHandlerImpl::GetLinkState(const nsString& aURLSpec, nsLinkState& aState)
+{
+  // XXX not yet implemented
+  aState = eLinkState_Unvisited;
+
+#ifdef NS_DEBUG
+  if (aURLSpec.Equals("http://visited/")) {
+    aState = eLinkState_Visited;
+  }
+  else if (aURLSpec.Equals("http://out-of-date/")) {
+    aState = eLinkState_OutOfDate;
+  }
+  else if (aURLSpec.Equals("http://active/")) {
+    aState = eLinkState_Active;
+  }
+  else if (aURLSpec.Equals("http://hover/")) {
+    aState = eLinkState_Hover;
+  }
+#endif
+  return NS_OK;
+}
+
 void LinkHandlerImpl::HandleLinkClickEvent(const nsString& aURLSpec,
 					   const nsString& aTargetSpec)
 {

webshell/tests/viewer/samples/test1.html

@@ -58,6 +58,12 @@ H4     { color: yellow;
 <p><br></p>
 <p>Here is an example of <b>bold</b>, <i>italic</i> and <b><i>bold-italic</i></b></p>
 <p><br></p>
+<p>Some links to test pseudo-classes</p>
+<p><a href="http://link">link</a></p>
+<p><a href="http://visited">visited</a></p>
+<p><a href="http://out-of-date">outofdate</a></p>
+<p><a href="http://active">active</a></p>
+<p><a href="http://hover">hover</a></p>
 <h2>Bulleted List </h2>
 <ul>
   <li>One</li>